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branches/zip: buf_LRU_search_and_free_block(): Do not try to preserve

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compressed pages, because doing so would require a call to
buf_buddy_alloc(), which in turn can invoke buf_LRU_get_free_block()
and buf_LRU_search_and_free_block(), potentially infinite recursion.
This commit is contained in:
marko 2007-02-19 14:23:32 +00:00
parent 9c663a0c46
commit df5a9376ea
1 changed files with 4 additions and 13 deletions
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17
buf/buf0lru.c
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@ -272,21 +272,14 @@ buf_LRU_search_and_free_block(
bpage = UT_LIST_GET_LAST(buf_pool->LRU);
if (UNIV_UNLIKELY(n_iterations > 10)) {
/* The buffer pool is scarce. Search the whole
LRU list, and also free any compressed pages. */
/* The buffer pool is scarce. Search the whole LRU list. */
while (bpage != NULL) {
mutex_t* block_mutex
= buf_page_get_mutex(bpage);
mutex_enter(block_mutex);
/* Discard also the compressed page. */
freed = buf_LRU_free_block(bpage, TRUE);
if (!freed && bpage->zip.data) {
/* Could not free the compressed page;
try freeing the uncompressed page then. */
freed = buf_LRU_free_block(bpage, FALSE);
}
mutex_exit(block_mutex);
if (freed) {
@ -309,8 +302,7 @@ buf_LRU_search_and_free_block(
= buf_page_get_mutex(bpage);
mutex_enter(block_mutex);
/* Preserve any compressed page. */
freed = buf_LRU_free_block(bpage, FALSE);
freed = buf_LRU_free_block(bpage, TRUE);
mutex_exit(block_mutex);
if (freed) {
@ -327,7 +319,7 @@ buf_LRU_search_and_free_block(
} else {
/* There are few compressed blocks. Skip compressed-only
blocks in the search for the least recently used block
that can be freed. Preserve any compressed page. */
that can be freed. */
ulint distance = 100
+ (n_iterations * buf_pool->curr_size) / 10;
@ -338,8 +330,7 @@ buf_LRU_search_and_free_block(
buf_block_t* block = (buf_block_t*) bpage;
mutex_enter(&block->mutex);
/* Preserve any compressed page. */
freed = buf_LRU_free_block(bpage, FALSE);
freed = buf_LRU_free_block(bpage, TRUE);
mutex_exit(&block->mutex);
if (freed) {